menadione

noun
men·a·di·one | \ˌme-nə-ˈdī-ˌōn, -dī-ˈ\

Definition of menadione 

: a yellow crystalline compound C11H8O2 with the biological activity of natural vitamin K

First Known Use of menadione

1941, in the meaning defined above

History and Etymology for menadione

methyl + napthalene + di- + ketone

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The first known use of menadione was in 1941

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menadione

noun
men·a·di·one | \ˌmen-ə-ˈdī-ˌōn, -dī-ˈ \

Medical Definition of menadione 

: a yellow crystalline compound C11H8O2 with the biological activity of natural vitamin K

called also vitamin K3

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